Danfoss VLT HVAC Basic Drive FC 100 Series Design Manual page 28

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Introduction to VLT HVAC Ba...

The Remote Reference is comprised of

•

Preset references

•

External references (analog inputs and serial

communication bus references)

•

The Preset relative reference

•

Feedback controlled setpoint

Up to 8 preset references can be programmed in the

frequency converter. The active preset reference can be

selected using digital inputs or the serial communications

bus. The reference can also be supplied externally, most

commonly from an analog input. This external source is

selected by one of the 3 Reference Source parameters

(3-15 Reference 1 Source, 3-16 Reference 2 Source and

3-17 Reference 3 Source). All reference resources and the

bus reference are added to produce the total External

Reference. The External Reference, the Preset Reference or

the sum of the two can be selected to be the active

reference. Finally, this reference can by be scaled using

3-14 Preset Relative Reference.

The scaled reference is calculated as follows:

(

)

Reference = X + X ×

100

Where X is the external reference, the preset reference or

the sum of these and Y is 3-14 Preset Relative Reference in

[%].

If Y, 3-14 Preset Relative Reference is set to 0%, the

reference will not be affected by the scaling.

VLT HVAC Basic Drive Design Guide

MG.18.C2.02 - VLT

is a registered Danfoss trademark

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